B. I speak not to disprove what Brutus spoke, / But here I am to speak what I know.
Explanation:
In these lines, Mark Antony tells us that the only things he wants to talk about are the things that he knows. This is an idea that can be defined as "logos." Logos refers to a mode of persuasion in which the speaker uses logic, facts and arguments in order to convince the audience of a particular position. Mark Antony promises to use these devices in order to prove his point.
